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远侧和近侧缺氧反应元件合作调节组织特异性促红细胞生成素基因表达。

Distal and proximal hypoxia response elements cooperate to regulate organ-specific erythropoietin gene expression.

机构信息

University of Zurich.

University of Oxford.

出版信息

Haematologica. 2020 Dec 1;105(12):2774-2784. doi: 10.3324/haematol.2019.236406.

Abstract

While it is well-established that distal hypoxia response elements (HREs) regulate hypoxia-inducible factor (HIF) target genes such as erythropoietin (Epo), an interplay between multiple distal and proximal (promoter) HREs has not been described so far. Hepatic Epo expression is regulated by a HRE located downstream of the EPO gene, but this 3' HRE is dispensable for renal EPO gene expression. We previously identified a 5' HRE and could show that both HREs direct exogenous reporter gene expression. Here, we show that whereas in hepatic cells the 3' but not the 5' HRE is required, in neuronal cells both the 5' and 3' HREs contribute to endogenous Epo induction. Moreover, two novel putative HREs were identified in the EPO promoter. In hepatoma cells HIF interacted mainly with the distal 3' HRE, but in neuronal cells HIF most strongly bound the promoter, to a lesser extent the 3' HRE, and not at all the 5' HRE. Interestingly, mutation of either of the two distal HREs abrogated HIF binding to the 3' and promoter HREs. These results suggest that a canonical functional HRE can recruit multiple, not necessarily HIF, transcription factors to mediate HIF binding to different distant HREs in an organ-specific manner.

摘要

虽然远端缺氧反应元件 (HRE) 调节缺氧诱导因子 (HIF) 靶基因,如促红细胞生成素 (Epo),这已得到充分证实,但迄今为止尚未描述多个远端和近端 (启动子) HRE 之间的相互作用。肝脏 Epo 表达受 EPO 基因下游的 HRE 调节,但该 3' HRE 对于肾脏 Epo 基因表达不是必需的。我们之前鉴定了一个 5' HRE,并表明这两个 HRE 都可以指导外源报告基因的表达。在这里,我们表明在肝细胞中,3' HRE 而不是 5' HRE 是必需的,而在神经元细胞中,5' 和 3' HRE 都有助于内源性 Epo 的诱导。此外,在 EPO 启动子中还鉴定了两个新的推定 HRE。在肝癌细胞中,HIF 主要与远端 3' HRE 相互作用,但在神经元细胞中,HIF 主要与启动子结合,较少与 3' HRE 结合,而根本不与 5' HRE 结合。有趣的是,两个远端 HRE 中的任一个的突变都消除了 HIF 与 3' 和启动子 HRE 的结合。这些结果表明,一个规范的功能性 HRE 可以招募多个,不一定是 HIF,转录因子以组织特异性的方式介导 HIF 与不同的远端 HRE 的结合。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d2f9/7716368/5a7ae31dd473/1052774.fig1.jpg

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